“I just tried to get him help. He wouldn’t respond. He wouldn’t do anything,” said Paula Martin, Martin-Jimenez’s mother, who found her son shot to death.

Police were initially called to the intersection of I-35 and Highway 16 for a report of a shooting and found an SUV with bullet holes and a man, 20, who had suffered gunshot wounds to both arms, officials said. The 21-year-old driver of the SUV was detained and the male with gunshot wounds was taken to San Antonio Military Medical Center in stable condition.

Approximately 5 miles away, in the 1400 block of Villeret Boulevard, authorities said they found Martin-Jimenez.

Authorities said the two males in the SUV had driven up to the 1400 block of Villeret Boulevard, where they were talking to Martin-Jimenez when an argument ensued.

Martin-Jimenez and the two males in the SUV pulled guns on each other and began shooting, authorities said. Police haven't determined who initiated the shooting.

Martin, who took cover in the kitchen during the shooting, said she believes her son's friend is the one who fired at the SUV. She said the friend left before police arrived.

“He (my son) didn’t have a weapon. He just fell to the ground immediately. When they rolled him over, there was no weapon at all," she said.

Martin believes her son got mixed up with the wrong people at the wrong time.

“He was not an angel, but he was my baby. He was good to me. He wanted to take care of me,” she said. “He had a good heart. He just got mixed up in the wrong stuff.”